Segmental gear



Feb. 4, 1941. QVERBEY 2,230,902

' SEGMENTAL GEAR' Filed Feb. 5, 1940 2 Sheets-Sheet 1 In ventor HERMAN T OVERBE Y,

A iiomeys Feb. 4, 1941. QVERBEY 2,230,902

I SEGMENTAL GEAR Filed Feb. 5, 1940 2 Sheets-Sheet 2 Inventor 32 Haw/1 N 7' 0 VERSE Y,

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A iiorneys Patented Feb. 4, 1941 UNITED STATES SE GMENTAL GEAR Herman T. Overbey, Wadesboro, N. 0., assignor of one-half to J. F. Martin, Wadesboro, N 0.

Application February 5, 1940, Serial No. 317,432

, Claims.

The present invention relates to gear construction and has for its primaryobject to provide a segmental gear by means of which sections of the gear may be conveniently removed and re- 5" placed should the teeth thereof become broken or mutilated, and without necessitating a complete dismantling of the gear or shaft on which the gear is mounted.

An important object of ,the present invention is to provide a segmenta1 gear construction in which each of the segments are of duplicate formation for interchangeable assembly and providing an attaching plate for the sides of the gear segments and provided with lugs seated in recesses in the segments to secure the segments against movement relative to the plate.

A still further object is to provide a segmental gear construction of this character in which each of the segments have their inner edges conformably fitted on the shaft or bearing on which the gear is mounted to assist in supporting each of the gear segments in a rigid assembled position.

A still further object is to provide a device of this character of simple and practical construction, which is strong and durable, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which--- Figure 1 is a side elevational view of one embodiment of the invention.

Figure 2 is an edge elevational view thereof.

Figure 3 is a transverse sectional view taken substantially on a line 33 of Figure 1.

Figure 4 is a plan view of one of the gear segments.

Figure 5 is a fragmentary sectional view taken substantially on a line 5-5 of Figure 1, and showing an anchoring screw for the gears-egment to secure the same against displacement upon removal of one of the assembly plates.

Figure 6, is a side elevational view 01 a modified attaching plate and collar construction.

Figure 7 is an edge elevational view thereof.

Figure 8 is a transverse sectional view taken substantially on a line 88 of Figure 6.

Figure 9 is a side elevational View of a further modification.

Figure 10 is an edge elevational view thereof, and

Figure 11 is a transverse sectional View taken substantially on a line IIII of Figure 9.

Referring now to the drawings in detail, and with particular reference to Figures 1 to 5 inclusive, the numeral 5 represents the plurality of gear segments, which preferably comprise four in number to complete the gear and including the toothed outer edge 5 and the arcuate inner edge 1, adapted to rest against the hub or collar ,8 formed on an assembly plate 9. Each of the segments is provided with an oval-shaped recess I0 in each face thereof and adapted to conformably receive the lug II formed on the inner face of the plate 9.

The plate 9 is positioned at one side of the 1 segment 5 and at a relatively opposite side is positioned an assembly plate I2 likewise having lugs I3 formed on the inner face thereof for conformably seating in the recesses I4 of the adjacent face of the gear segments. The plate I2 20 is provided with a central opening I5 for receiving the collar 8 and the plates are secured in assembled position against opposite sides of the gear segments by means of bolts I6 extending therethrough. The collar 8 is provided with the usual bore I! for accommodating a shaft and extending longitudinally of the bore is the keyway I8 for anchoring the shaft in the bore of the collar. A set screw I9 may also be employed for securing the collar against movement on the 30 shaft.

When replacing any of the segments the plate I2 preferably is removed and in order to prevent displacement of all of the segments screws 20 are inserted through the segments for attaching the 35 same to the plate 9.

In the form of the invention illustrated in Figures 6 to 8 inclusive the gear segments are indicated at 2| and the assembly plates 22 and 23 are of identical construction and each provided with a hub or collar 20 for projecting outwardly 4 from the outer faces of each of the plates.

In this form of the invention the inner edge of the segments bear directly on the shaft 25 and the assembly plates are secured in position at opposite sides of the gear segments by bolts 26.

, .In the form of the invention illustrated in Figures 9 to 11 inclusive, a single assembly plate 21 is provided at one side of the gear segments 28 and secured thereto by bolts 29. The outer face 50 of the plate is provided with the collar 30 and the shaft 3| has a reduced portion 32 against which the inner edge of the gear segments abut and the shaft is further reduced as shown at 33 for snugly fitting in the bore of the collar 30. 55

A shoulder 34 is formed between the reduced portion 32 of the shaft and the main portion of the shaft which abuts the face of the gear segment opposite from the plate 21 and a similar shoulder 35 is formed between the reduced portions 32 and 33 of the shaft which abuts against the plate 21.

It will be understood that in each form of the invention the plates are formed with the lugs which conformably seat within the recesses formed on the face of the gear segments, and in each instance the attaching bolts are countersunk in the plates, and also in the gear segments in the form of the invention illustrated in Figures 9 to 11 inclusive.

It is believed the details of construction, advantages and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention, what I claim is:

l. A segmental gear construction comprising a plurality of duplicate gear segments, each segment including a toothed outer edge and an arcuate inner-edge, a member disposed axially of the segments against which the inner edge ofeach segment abuts, a plate positioned fiatwise against the segments, interengaging means between the opposed face of the plate and the opposed iace; of the segments and means for rermova-bly securing the segments individually to the plate.

2. A segmental gear construction comprising a plurality of duplicate gear segments, each segmentincluding a toothed outer edge and an arouate inner edge, a member'clisposed axially of the segments against which the inner edge of; each segment abuts, a plate positioned fiatwise against the segments, interfitting lugs and recesses carried by the opposed faces of the plate and the opposed faces of the segments to secure the segments in a fixed position when fiatwise engaging the plate and means for securing the segments individually fiatwise against the plate.

3. A segmental gear construction comprising a plurality of duplicate gear segments, each segment including a toothed outer edge and an arcuate inner edge, an assembly plate having a hub and interfitting lugs and recesses carried by the opposed face of the plate and the opposed faces of the segments for securing the segments to one face of the plate with the inner edges of the segments bearing on the hub.

l. A segmental gear construction comprising a plurality of duplicate gear segments, each segment including a toothed outer edge and an arcuate inner edge, a pair of assembly plates, a hub on one of the plates against which the inner edges of the segments abut and interfitting lugs and recesses carried by the opposed face of the plate and the opposed faces of the segments for securing the plates to opposite sides of the segments.

5. A; segmental gear construction comprising a plurality of duplicate gear segments, each segment including a toothed outer edge and an arcuate inner edge, a pair of assembly plates positioned fiatwise at opposite sides of the segments, means for securing the segments to one of the plates, the other of said plates retaining said securing means against displacement, common fastening means connecting both plates to the segments and interfitting lugs and recessed between the inner faces of the plates and the adjacent sides of the segments.

HERMAN T. OVERBEY. 

